An Implementation of DES and AES, Secure against Some Attacks

  • Authors:
  • Mehdi-Laurent Akkar;Christophe Giraud

  • Affiliations:
  • -;-

  • Venue:
  • CHES '01 Proceedings of the Third International Workshop on Cryptographic Hardware and Embedded Systems
  • Year:
  • 2001

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Abstract

Since Power Analysis on smart cards was introduced by Paul Kocher [7], many countermeasures have been proposed to protect implementations of cryptographic algorithms. In this paper we propose a new protection principle: the transformed masking method. We apply this method to protect two of the most popular block ciphers: DES and the AES Rijndael. To this end we introduce some transformed S-boxes for DES and a new masking method and its applications to the non-linear part of Rijndael.